9. Holding in service
The use of zinc codeposits to improve the corrosion resistance of systems is becoming increasingly common, particularly in the automotive industry. The protective effectiveness of these coatings is closely linked to their free potential (E i=0 ). The sacrificial nature of non-passivated, non-degassed Zn-X coatings for the protection of XC18 steel is illustrated in table 12 .
The incorporation of an additive element, excluding manganese, which is more electropositive than zinc on the Pauling scale, increases the free potential of the codeposit.
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The anti-corrosion performance of Zn-X coatings is assessed by exposure to salt spray, in accordance with NF ISO 9227 (table...
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Holding in service
Conclusion
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